I have two issues that have persisted from VL5.9 and also are in VL6. I have two machines with VL and these are not an issue on the other one. If any one has a clue about these, I sure would appreciate hearing your thoughts.
1) Many times, moving the cursor, usually toward the upper-left corner of a window, the window disappears leaving only the top, blue line. After a while I found that by right-clicking on it, I could select un-shade. Some times, this anomoly will switch screens (the 4 screen selection near the exit button). (It is possible that this could be a problem with the mouse as I sometimes have difficulty right-clicking. Just don't have a spare one with wheel to replace it.)
I don't know about your second issue, but for the first issue I have a guess.
I'm assuming your either using a touchpad with scroll enabled or you are keeping a finger on your mousewheel as you use it.
If you touch the top bar of a window moving upwards and your finger hits the scroll portion of the touchpad then the window will automatically shade. Same thing if you roll up on the mouse as you cross over that bar.